Mikronauts.com

LeMaker has added some information and photos to their Wiki, so I updated my LeMake Guitar Preview.
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I also added a LeMaker Guiter BaseBoard Preview 🙂

I’ve been wanting to re-organize the left hand navigation column for ages, but never quite found the time to ‘deep dive’ into the theme PHP code.

(click on the image to see the old very long pages bar)

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Categories have been moved higher on the menu bar, and I also added collapsing Archives.

I will need to edit the parent pages so they are more relevant, however this might be a good start in improving site navigation!

Touch screens are great. Keyboards are often necessary. But what if all you need is a numeric keypad?

(click on image for larger version)

In my latest article, I show you how you can easily add a 4×4 keypad to your Raspberry Pi using an MCP23017 I/O expander and Python.
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I also present a very easy to use Python library to read the keypad.

https://www.mikronauts.com/raspberry-pi/raspberry-pi-i2c-4×4-matrix-keypad-with-mcp23017-and-python/

I need to program a lot of  EEPROM’s. Frankly I got scared of the prices I saw for commercial gang programmers that could program the 24LC256 and 25LC512 EEPROM’s I use.

A bit of googling found software I could use to program EEPROM’s with a Raspberry Pi, so I made an eight EEPROM gang programming board!

(click on the image for a larger version)

A bit of wiring on a prototyping board, a new shell script, and typing

sudo ./blast.sh
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now programs eight EEPROM’s for me! No more programming them one at a time!

Follow the link below for the full article, including schematics, link to the software, gang programming script etc

Making a Raspberry Pi based I2C EEPROM Gang Programmer

Article Index:

1. Why am I building a gang programmer?
2. The Hardware
3. The Software

For “normal” computer use, you can’t beat large LCD monitors – and the Raspberry Pi comes with both an HDMI interface, and an LCD display connector, for which the Raspberry Pi foundation will be releasing LCD displays.

But what if you don’t need a large, colourful LCD display?

(click on the image for larger version)

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Article Index:

1. Introduction, Equipment Used, Connecting an LCD Module to the Raspberry Pi
2. 1602 Character LCD Module, 2004 Character LCD Module, MikEzLCD.py library
3. Using both 1602 and 2004 LCD Modules with the Raspberry Pi at the same time, Conclusion